Details: Here's an interesting little LEGO machine - it uses various LEGO TECHNIC parts to replicate a toy marble machine. On it's own, that would be cool enough, but this also has a motorized ladder that lifts the marbles back up to the top of the course regularly. The mechanism appears to be a sort of enlarged cam type thing. You can get the idea fairly quickly from the video below. Oh, and I saw that there was an RCX in the video, but since it's being used as an expensive battery box, I'm not going to count this one as a robot.Here's the video of this in motion:

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